package ACM.meituan;

/**
 * @Author wwk
 * @DATE 2022/8/20 10:02
 */
import  java.util.*;
public class first {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        StringBuilder sb = new StringBuilder();
        String hun = scanner.next();
        String su = scanner.next();
        for (int i = 0; i < n; i++) {
            sb.append(hun.charAt(i));
            sb.append(su.charAt(i));
        }
        System.out.println(sb.toString());
    }
}
